Dr. Guoan Li received a BE degree in Aerospace Engineering in 1982 from the Northwestern Polytechnic University (Xian, China), a MS degree in Solid Mechanics in 1985 from the Chinese Academy of Science (Beijing, China), and a PhD degree in Mechanical Engineering in 1993 from The Johns Hopkins University (Baltimore, MD, USA). His main research interest is in Orthopaedic Biomechanics, including degeneration/injury mechanisms of human knee/hip joints and spine and development of new treatment strategies. Recently, he has also devoted his effort to the development of new techniques for ACL reconstruction and artificial joint replacements including TKA, THA and TDR.